I want to say "My brother and I are twins" in another way. Is it right to say 'My brother is my twin' ?

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    Certainly you may say that, and it will be proper grammar. (I don't know if it's true, but that's a different question.) – Hot Licks Dec 27 '15 at 23:40
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    It's grammatical, logical, and unambiguous. But it would rarely be used (except as a dramatic revelation). – Edwin Ashworth Dec 27 '15 at 23:41
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    It would be perfectly normal if, for example, everyone already knew he was your brother. – Araucaria - Not here any more. Dec 27 '15 at 23:56
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    @Araucaria - Yes. You might, for example, show someone a picture of him and say "This is my brother Fred." Then "My brother is my twin" would be a perfectly normal second sentence. – Hot Licks Dec 28 '15 at 0:12
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    @HotLicks I would expect "We're twins" to be the vastly preferred follow-up. – Hellion Dec 28 '15 at 15:48

The sentence "My brother is my twin" is grammatically correct. There is absolutely nothing wrong with the grammar.

The next question is, "Is it readily understood?" It absolutely is. There is no (reasonable) way to interpret this sentence other than to understand that the speaker has a brother, and the speaker and the speaker's brother are twins.

The last question is, "Does it sound right?" In other words, is it semantically awkward? Under certain circumstances (see the following paragraphs), I would suggest that the following phrases are more common, and by extension, would be considered less awkward:

  • "We are twins."
  • "My brother and I are twins."
  • "My twin brother and I ..."
  • "I have a twin brother."

What makes this sentence (potentially) awkward is that any twin of yours will implicitly be your sibling. So there is considerable semantic overlap between the terms "brother" and "twin." Thus, whether or not the sentence is awkward depends on how much information the listener already has (or is expected to have):

  • If the listener already knows about the existence of a brother, this would be the appropriate way to further indicate that that person is your twin. It would be equivalent of (as valid as) "Fred is my twin."
  • If the listener doesn't even know that the speaker has a brother, then the less awkward phrase would be "I have a twin brother."

Type "My brother is my twin" into Google and check out the first two of nearly 24,000 results. ;)

Not that Google results always equate with proper grammar, but, as others have said, the sentence is just fine, though it sounds a little awkward.

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    '... the sentence is just fine, though it sounds a little awkward' is a contradiction in terms. – Edwin Ashworth Dec 28 '15 at 0:12
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    Not at all; I mean it's just fine grammatically, but it sounds odd. Sumelic made the same observation. – David Blomstrom Dec 28 '15 at 1:25
  • Don't think it even sounds awkward, myself. – The Nate Dec 28 '15 at 3:27
  • Downvoting. Top result of "My brother is my twin" pointed to this page. This is why we should not refer people to Google results (Google results can change). Also, the 2nd and 4th results had to do with sisters incestuously mating with twin brothers. That seems to have nothing to do with the topic of English usage. Finally, I disagree that the sentence sounds awkward. So I have three disagreements with this two-sentence answer, hence concluding that it deserves my down-vote. – TOOGAM Dec 28 '15 at 9:50
  • 'The sentence is just fine, though it sounds a little awkward' is unacceptable. '. There is no grammatical issue. But it doesn't sound as normal as....' are sumelic's actual words, and they are just fine. Since you haven't adjusted your statement, I'll add my downvote. – Edwin Ashworth Dec 28 '15 at 11:25

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